2nd Grade · Week 1 of 36 · Math
Add within 100 (no regroup)
1. Hook
- Tap Read the lesson aloud (or a grown-up reads).
- Look at the pictures. Follow the numbered steps.
- Do the tap-and-try lab on this page. Do not skip it.
- Fill the short answers with a grown-up nearby.
- Do the quiz. Then teach it back in your own words.
You are at home on a computer or tablet. Everything you need is on this page.
32 + 45. Can you add the tens, then the ones, in your head?
Then: lab → guided → quiz → teach it back. The lab is the lesson, not a decoration.
2. Teach
Today we learn: Add within 100 (no regroup).
Standards alignment: CCSS.MATH.CONTENT.2.NBT (domain-level; works with any state’s standards)
STEM this week is Add within 100 (no regroup): try it, then check a second way.
- Line up tens under tens and ones under ones.
- Add ones first, then tens.
- 32 + 45: ones 2 + 5 = 7, tens 30 + 40 = 70, total 77.
Place-value blocks: rods for tens, cubes for ones. Combine rods with rods, cubes with cubes.
Mental way: break apart. 53 + 24 = 50 + 20 + 3 + 4 = 70 + 7 = 77.
- Problem: 61 + 27.
- Ones: 1 + 7 = 8.
- Tens: 60 + 20 = 80.
- Total: 88.
- Check with an estimate: about 60 + 30 = 90. Close!
Solve: 23 + 54, 40 + 36, 71 + 18, 12 + 85. Show one with blocks or a drawing.
Adding a tens digit to a ones digit because columns weren't lined up. Line up places.
Adding scores, prices, and pages read uses two-digit addition.
No classroom teacher today — this page is the lesson. A grown-up sits nearby. Model once, wait 10–20 seconds, then let the child try.
Try it — this is the game
Tap, move, listen. This is the experiment. Then we quiz what you just did.
Play & explore
Hands-on practice for this lesson. Your progress saves automatically.
Your work — type it here
Type the answer. Then tap Check my work. This is the assignment — not optional reading.
3. Guided practice
Try these with me — type the missing word, then check.
Reveal the thinking
Add ones, add tens, combine.
4. Independent practice
Work the set. Check when finished — this is practice (mastery quiz is next).
5. Mastery check
Scored quiz — results save to your gradebook.
Show the math — don't only tap a letter
The lab is the worked example you can move. Then the quiz checks that you own Add within 100 (no regroup).
A grown-up sits nearby. This page is the teacher. A grown-up sits nearby. This page is the teacher.
6. Reflection / teach-back
Teach-back: Explain Add within 100 (no regroup) in your own words. Give one example and name the usual mistake.